Multiple sclerosis (MS) is an inflammatory disease of the central nervous system, beginning most often in subjects aged 20-40 years. In France, thanks to recent studies reported during general states of MS in 2006, the prevalence is estimated at 65.5 / 100,000 population (96.3 / 100,000 women and 41.9 / 100,000 men) and incidence at 7.91 per 100,000. In Lower Normandy, the incidence of MS is estimated to 4.45 / 100,000 inhabitants or 60 new cases per year.